In the Legend Of Korra-, an earthbender, Bolin, can bend lava. (And so can one other earthbender). This could be because Bolin is the son of an earthbender and a firebender. So lava bending is the result of a mixed bending family.
The gaang! I swear if there is not an epic fight scene featuring old Zuko, Toph, and Katara against the bad guys I don't know why they made this show. <----- Well, Aang an Sokka are dead already so . also, is anyone else upset about gran-gran?